Switch control and indication system



' May 6, 1941. H. SQYOUNG SWITCH CQNTROL AND INDICATION SYSTEM Filed March 31, 1939 2 Sheets-Sheet 1 NEE MMQQ

May 6, 1941. YOUNG I 2,241,048 I SWITCH CONTROL AND INDICATION SYSTEM Filed March 31, 1939 2 Sheets-She et"2 Traffic {L/ Cari/'00s?!- EW/m Eiwm B 240 3 245 E 204- @Mm x: r T257 5 265 25a a wgzzw lz [08d H 15 A'II'TORNEY Patented May 6, 1941 UNETE er orrlcs SWITCH CONTROL AND INDICATION SYSTEP/I Application March 31, 1339, Serial No. 265,257

12 Claims; (61. 2i6219) My invention relates to an improved system for controlling the motor for operating a railway track switch and for providing an indication of the position occupied by the switch.

It has recently been proposed to provide interlocking systems employing relays exclusively, instead of the mechanically interconnected control apparatus heretofore employed, and this control system is designed particularly for use in, all relay type interlocking installations.

It is also proposed to employ in interlocking systems of the kind referred to above relays of the plug-in type, that is, relays having contact pins or sockets which are adapted to be detachably received by cooperating contact sockets or pins carried by a base member which is permanently secured to a support and to which connections are made for the conductors forming the circuits controlled by the relay contacts. Plug-in type relays are advantageous as the relaysmay be readily removed and replaced for servicing or for inspection, while a relay of this type may be quickly and easily replaced by another if desired.

Unless some means is provided to prevent such an occurrence, vibrations, such as caused by passing trains, may, when the relay armature is released, produce such movement of the relay armature as to cause the back contacts of the relay, that is, the contacts which are closed when the relay armature is released, to become open, while the armature may move sumciently to effect closing of the relay front contacts.

It has heretofore been proposed to provide cushioning or shock absorbing means to protect relays from vibration of this kind, but the construction and mounting of plug-in type relays is such that it is difficult or impractical to employ cushioning means to protect them. Accordingly it has been proposed to incorporate in such relays a permanent magnet which serves to hold the relay armature in its released position and to prevent movement of the armature from the released position as a result of vibration. A relay incorporating the permanent magnet hold-down feature is responsive to energization of its winding with current of one relative polarity only.

A relay of this type which may be employed in the system shown in this application is shown in United States Patent No. 1,959,562, issued May 22, 1934, to Harry E. Ashworth.

It is an object of my invention to provide a switch control system employing relays of a type having a permanent magnet for normally maintaining the relay armature in its released position.

, A further object of my invention is to provide an improved switch control system adapted for use in all relay; types of interlocking installations.

Another object of my invention is to provide an improved switch control system employing relays of the type having a permanent magnet to maintain the relay armature in its released position, the system being adapted for use in all relay types of interlocking installations. Another object of my invention is to provide an improved switch control system employing relays which are responsive to current of one polarity only instead of the polarized relays heretoiore employed which are selectively responsive to current or opposite relative polarity.

A further object of my invention is to provide a switch control system employing a normal and a reverse control relay operative when energized to effect movement of the switch to its normal or reverse positions, respectively, the system being arranged so that on energization of the winding of either control relay a circuit is established to maintain the winding of that control relay energized until the winding of the other control relay is energized to thereby insure that when the switch is moved to one of its positions, it will remain in that position until it is intentionally moved therefrom.

Another object of my inventionis to provide an improved switch control and indication system.

Other objects of my invention and features of novelty will be apparent from the following description taken in connection with the accompanying drawings.

I shall describe four forms of apparatus embodying my invention, and shall then point out the novel features thereof in claims.

In the drawings,

Fig. l is a diagram showing one system embodying the improved switch control and indication system provided by my invention,

Fig. 2 is a modified form of system embodying my invention,

Fig. 3 is a further modification which I may employ, and

Fig. 4 is still another modification which I may employ.

In the system shown in Fig. 1, as well as in other figures of the drawings, the switch W may be but one of several switches of a group of switches which may be selectively operated to provide a plurality of difierent routes through the location in which the switches are situated.

Referring to Fig. 1 of the drawings, the reference character W designates a railway track switch which is movable between a normal and a reverse position by a suitable motor, here shown as a pneumatic motor..

The supply of fluid under pressure to the motor is controlled by a lock magnet valve device LMV, a normal magnet valve device NMV and a reverse magnet valve device RMV.

The magnet valve devices associated with the motor control the supply of fluid under pressure thereto in the usual manner. The lock magnet valve device LMV is operative when energized to permit the supply of fluid under pressure to the motor, and when deenergized to cut off the supply of fluid under pressure to the motor.

The normal magnet valve device NMV is operative when energized to direct the flow of fluid under pressure supplied through the lock magnet valve device LMV to effect operation of the motor to cause movement of the switch W to the normal position, while the reverse magnetic valve device RMV is operative when energized to direct the flow of fluid under pressure supplied through the lock magnet valve device LMV to cause operation of the motor to move the switch W to the reverse position.

The circuits of the windings of the magnet valve devices are controlled by a normal control relay WNR, a reverse control relay WRR, and by the normal and. reverse switch indication or switch repeating relays NWPR and RWPR, respectively. The supply of current to the windings of the switch indication or switch repeating relays is controlled by contacts I and II which are movable in accordance with movement of the switch W.

The circuit for energizing the winding of the reverse control relay WRR is controlled by a reverse push button stick relay RPBSR, by a reverse route relay RRR, and by the lock relay LR.

The pick-up and stick circuits for the normal and reverse push button stick relays are controlled by normal and reverse push buttons NPB and RPB, respectively, while the stick circuit for each of these relays is also controlled by a contact of the relay as well as by a contact of the other one of the stick relays. In addition, the circuits of the windings of the push button stick relays are controlled by a contact of the lock relay LR to prevent energization of either of the stick relays at a time when the lock relay is deener gized to thereby prevent storage of switch con trol.

The circuit of the winding of the normal route relay NRR is controlled in any suitable manner by means not shown so that the relay winding is energized when and only when a route is established which includes the switch W in the normal position.

Similarly, the circuit of the winding of the reverse route relay RRR is controlled in any suitable manner by means not shown so that the relay winding-is energized when and only when a route is established which includes the switch W in the reverse position.

The control of the circuits of the windings of the normal and reverse route relays NRR and RRR is not a part of this invention, and any suitable means well known in the art may be employed for the purpose.

Similarly, the control of the circuit for energizing the winding of the lock relay LR does not form a part of this invention, and this circuit may be controlled in the manner well known in the art so that the relay winding is energized when and only when it is safe to efiect movement of the switch W between its two positions.

One form of apparatus for controlling the supply of energy to the windings of the route relays NRR and RRR and to the winding of the lock relay LR is shown in application Serial No. 118,609, filed December 31, 1936, by John M. Pelikan.

The normal and reverse control relays WNR and WRR, the normal and reverse indication relays NWPR and RWPR, and the lock relayLR are of the type having a permanent magnet to aid in maintaining the relay armature in its released position.

The normal and reverse push buttons NPB and RPB are of the type having a movable member which is biased to an intermediate position, while the movable member is moved in one direction from this position when pressure is applied to the push button knob and is moved in the other direction from this position when the knob is pulled.

The normal push button NPB has a normally open contact I2 which engages contact I3 when pressure is applied to the knob of the push button. This push button also has normally closed contacts 24 and 25 which become open when the knob of the push button is pulled.

Similarly, the reverse push button RPB has a normally open contact 32 which engages contact 33 when pressure is applied to the knob of the push button, while this push button also has normally closed contacts 38 and 39 which become open when the knob of the push button is pulled.

The switch operated contacts I0 and II control supply of current and also the polarity of the current supplied to supply wires for energizing the switch indication or switch repeating relays NWPR and RWPR, while the normal and reverse control relays WNR and WRR control the circuits of the windings of the relays NWPR and RWPR,.

The contact I0 has wire I5 connected thereto, while contact II has wire 20 connected thereto. The contacts I0 and II are arranged so that contact I0 engages a stationary contact I02 and the contact II engages a stationary contact I03 when and only when the switch W is in the normal position. Similarly, the contacts I0 and II are arranged so that the contact I0 engages a contact 9! and the contact II engages contact I02 when and only when the switch W is in the reverse position.

While the contacts I0 and II have been described as engaging the associated stationary contacts when the switch W is in one position or the other, it should be understood that these contacts may be arranged in the manner well known in the art so that the circuits controlled thereby will be complete when and only when the switch not only is in one position or the other, but is also locked in that position.

The contact I02 has supply wire I04 connected thereto, while contacts 91 and I03 have supply wire Hi5 connected thereto.

It will be seen that when the switch W is in one position, current of one relative polarity is supplied from wires I5 and 20 through the contacts I and II to the supply wires I04 and I05, whilein the other position of the switch W cur-.- rent of the opposite or reverse relative polarity is supplied to the Wires I04 and. I05.

As previously pointed out, the relays NWPR and RWPR are of a type which incorporate a permanent magnet to secure their armatures in their released positions and are responsive to current of one relative polarity only. The various parts of this system are arranged so that the contacts of the normal indication relay NWPR become picked up only when the relay winding is energized with current of the polarity which is supplied to the supply wires I04 and I in the normal position of the switch W. Similarly, the contacts of the reverse indication relay RWPR become picked up only when the relay Winding is energized with current of the polarity which is supplied to the wires I04 and I05 in the reverse position of the switch W.

The supply wire I04 is connected to one terminal of the windings of the relays NWPR and RWPR, while supply wire I05 is connected to contact I01 of relay WNR, and also to contact I08 of relay WRR. Contact I01 when released H engages contact I09 which is connected by wire I I0 to a terminal of the Winding of relay RWPR, while contact I08 when released engages contact H2 which is connected by wire II3 to a terminal of the winding of relay NWPR.

Thus it will be seen that the circuit of the winding of the reverse indication relay RWPR is complete only when the contacts of the normal control relay WNR are released, and that the circuit of the winding of the normal indication relay NWPR is complete only when the contacts of the reverse control relay WRR are released.

The indication relays NWPR and RWPR have contacts other than those shown in the drawings for controlling the signals, not shown, which are associated with the switch W, The control of the signals may be effected in any suitable manner well-known in the art.

Similarly the indication relays NWPR and RWPR may be provided with contacts, not shown, and controlling circuits which control indication means, not shown, for indicating at a remote point, as for example at the point at which the push buttons NPB and RPB are located, the position occupied by the switch W.

The equipment is shown in the drawings with the switch W in the normal position and with the lock relay LR, the normal control relay WNR, and the normal indication relay NWPR energized. The equipment is also shown with the normal and reverse route relays NRR and RRR deenerglzed.

At this time the winding of the relay WNR is energized by current supplied over the stick circuit established by its own contact. 'I'his'circuit is traced from terminal B of battery I6 through wire I5, contacts II-66 of relay WNR, wire 61, contacts 68-13 of relay WRR, wire 52, winding of relay WNR and wire 20 to terminal C of battery I3.

As the winding of relay WNR is energized, the contacts of this relay are picked up and contact H of the relay engages contact 80 and establishes connection from wire 8I to wire I5 leading to the winding of the lock magnet valve device LMV. However, at this time, as explained below, contact 83 of relay NWPR is picked up and no connection is established from the wire t B nd cord n y he w d g of the lock magnet valve device LMV is not energized. Since the lock magnet valve device LMV is not energized, this valve device prevents the supply of fluid under pressure to the switch motor.

At this time the winding of normal indication relay NWPR is energized from the supply wires I04 and I05 over a circuit established by contact. I08 of relay WRR, This circuit is traced from wire I05 through contacts I08-I I2 of relay WRR, wire II3, winding of relay NWPR and wire I04.

At this time as the switch W is in the normal position, the contacts I0 and II effect the supply of current from wires I5 and 20 to wires I04 and I05 of a polarity efi'ective to cause picking up of the contacts of relay NWPR.

As the normal control relay WNR is energized and as the'relays WRR and RWPR are not energized, a circuit is established to energize the winding of normal magnet valve device NMV. This circuit is traced from terminal B of battery I6 through wire I5, contacts 90-88 of relay RWPR, wire 86, contacts 99-98 of relay WRR, wire 96, contacts 94-93 of relay WNR, wire 92, winding of magnet valve device NMV, and wire 20 to terminal C of battery I6.

As the winding of the lock magnet valve device LMV is deenergized, the normal magnet valve device NMV, even though energized, is ineffective to supply fluid under pressure to the motor for the switch W. However, if the switch W should creep from the normal position, contacts I0 and II will be moved out of engagement with contacts I02 and I03, thereby interrupting the circuit for energizing the winding of relay NWPR with the result that contact 83 of relay NWPR will become released and will complete the circuit of the winding of the lock magnet valve device LMV. The circuit for energizing the lock magnet valve device LMV at this time is traced from terminal B of the battery I5 through wire I5, contacts 83-82 of normal indication relay NWPR, wire 8|, contacts -11 of normal indication relay WNR, wire 15, winding of lock magnet valve device LMV, and wire 20 to terminal C of the battery I6.

On energization of the winding of the lock magnet valve device at a time when the winding of the normal magnet valve device NMV is energized, fluid under pressure is supplied to the switch motor to cause the motor to return the switch W to the normal position. When the switch reaches the normal position, contacts I0 and II again establish the circuit for energizing the winding of the relay NWPR, While the contact 83 becomes picked up and interrupts the circuit of the lock magnet valve device LMV which thereupon operates to cut ofi the supply of fluid under pressure to the switch motor,

If at this time the operator desires to effect movement of the switch W from the normal to the reverse position, he may do so by applying pressure to the knob oi the push button RPB. This will close contacts 32 and 33, thereby completing the pick-up circuit for the winding of relay RPBSR. This circuit is traced from terminal B of battery I6 through push button contacts 32-33, wire 34, winding of relay RPBSR, wire 35, contacts 35-3'1 of relay NRR, wire 2I, contacts 22-23 of relay LR, and wire 20 to terminal C of battery I6. Accordingly contacts 30, II and 55 of relay RPBSR become picked up and contact 4| establishes a stick circuit for the winding of this relay. This circuit is traced from wire I5 through contacts 39-.38 of push button RPB, wire 40, contacts II- 42 of relay RPBSR, wire 43, contacts 4544 of relay NPBSR, wire 34, winding of relay RPBSR, wire 35, contacts 363'I of relay NRR, wire 2!, contacts 22 23 of relay LR, andwire to terminal C of battery Hi.

It will be seen that thepick-up and stick circuits for the relay RPBSR include a contact of the normal route relay NRR and a contact of'the lockrel-ay LRR so that the relay. RPBSR, can be energized only when the contacts of the normal route relay are released and the contacts of the lock relay are picked up. This insures that the relay RPBSR can be energized only when it is safe to eiTect movement of the switch to the reverse position.

Contact 56 of relay RPBSR, when picked up, completes the pick-up circuit for the winding of the reverse control relay WRR provided the contacts of the reverse route relay RRR are released. This circuit is traced from terminal B of battery I6 through wire I5, contacts 56-51 of relay RPBSR, wire 58, contacts 59-6IJ of relay RRR, wire 52, contacts 63-64 of relay LR, wire 65, winding of relay WRR and wire 20 to terminal C of battery I6.

It will be seen that on picking up of the contacts of relay RPBSR, contact of the relay interrupts the stick circuit for the winding of relay NPBSR to thereby deenergize the winding of this relay if it is maintained energized by current supplied over its stick circuit.

Since the circuit controlled by the relay RPBSR for energizing the reverse control relay WRR includes a back contact of the reverse route relay ERR, this circuit can be established only if the contacts of the relay RRR are released. If the contacts of the relay RRR are picked up, the relay WRR will be energized by current supplied over the circuit which is traced from terminal B of battery I6 through wire I5, contacts til-60 of relay RRR, wire 62, contacts 6364 of lock relay LR, wire 65, winding of relay WRR, and wire 26 to terminal C of battery I6.

On energization of the winding of the reverse control relay WRR and picking up of the contacts of this relay, contact 68 becomes picked up and interrupts the previously tracedstick circuit for the winding of the normal control relay WNR. On picking up of contact 68 it engages contact I4 to which is connected a branch of Wire I5, while on deenergization of the winding of normal control relay WNR, its contact 66 becomes released and engages contact ID to establish the stick circuit for the winding of reverse control relay WRR. This circuit is traced from wire I5 through contacts 'M68 of relay WRR, wire 61, contacts 66-10 of relay WNR, wire 65, winding of relay WRR and wire 20.

On picking up of contact I98 of relay WRR the circuit of the winding of relay NWPR is interrupted and contact 83 of this relay becomes released to establish connection from wire I5 to wire 8|.

On deenergization of the winding of relay WNR and release of the contacts of this relay, contact I 94 of the relay becomes released to thereby interrupt the circuit of the winding of the normal magnet valve device NMV, and to establish connection from wire 8| to wire 96, while on picking up of contact 98 of relay WRR connection is established from wire 96 to wire IUI leading to the winding of the reverse magnet valve device RMV. The circuit for energizing the winding of magnet valve device RMV is now canoes complete and is traced from wire I5 through contacts 8382 of relay NWPR, wire 8|, contacts 9594 of relay WNR, Wire 96, contacts 98I0ll of relay WRR, wire IllI, Winding of magnet valve device RMV, and wire 20.

On release of contact I01 of relay WNR. the circuit for energizing the winding of relay RWPR from the wires IM'and I 65 i complete, but at this time, as the switch W is still in the normal position, the polarity of the current supplied to the wires I84 and I65 is not that which is efiective to cause picking up of the contacts of relay RWPR, but instead is that which is effective to cause the contacts of the relay to be held in their released position with greater than usual force. Accordingly contact 90 of relay RWPR is in engagement with contact 88 at the time that contact "I8 of relay WRR becomes picked up, and on picking up of contact I8 the circuit for energizing the lock magnet valve device LMV is complete This circuit is traced from wire I5 through contacts 96-88 of relay RWPR, wire 86, contacts -78 of relay WRR, wire I5, winding of lock magnet Valve device LMV, and wire 28.

As both the lock magnet valve device LMV and thereverse magnet valve device RMV are energized, fluid under pressure is supplied to the motor for the switch W to efiect movement of the switch W to the reverse position. On movement of the switch W away from the normal position contacts I6 and I I are moved out of engagement with the stationary contacts associated therewith, thereby interrupting the supply of current to, the supply wires I04 and I05. On the resultant deenergization of the Winding of relay RWPR the contact 96 of this relay remains in engagement with contact 88, being held in engagement therewith by gravity and by the permanent magnet incorporated in the relay.

When the switch W attains the reverse position, contact I!) engages contact 91 and contact I I engages contact Hi2, thereby effecting the supply of current from wires I5 and 29 to supply wires I84 and I65 of a polarity effective to cause picking up of contact 90 of relay RWPR. When the contact 90 of relay RWPR. 'is picked up, it interrupts the circuit for energizing the lock magnet valve device LMV, and this valve device thereupon operates to prevent further supply of fluid under pressure to the motor for the switch W.

At this time the winding of the reverse magnet valve device RMV continues to be energized over the previously traced circuit so that in the event the switch W creeps from its reverse position, and the lock magnet valve device LMV becomes energized, fluid under pressure will be supplied to the switch motor to return the switch to the reverse position.

In the event the switch W does creep from the reverseposition contacts II] and II Will be moved out of engagement with the stationary contacts associated therewith, thereby interrupting the circuit for energizing the winding of relay RWPR and the contact 90 of this relay will become released to reestablish the circuit of the Winding of the lock magnet valve device LMV. As soon as the switch W is returned to the reverse position, contacts Ill and II will again efiect the supply of current to the supplywires I04 and IE5 and contact 9Il of relay RWPR will become picked up and, will interrupt the circuit of the winding of the lock magnet valve device.

I If on movement of the switch W to the reverse position the operatonwishes to release the contacts of the relay RPBSR, he may do so by pulling on the knob of the push button RPB. This opens the contacts 38 and '39 and interrupts the stick circuit for the Winding of the relay RPBSR. Accordingly the contacts 30, 4| and 56 of this relay become released. On opening of contact 56 the pick-up circuit for the winding of reverse control relay WRR is interrupted, but the winding of this relay continues to be energized by current supplied over the stick circuit for the rel-ay winding which was established on picking up of its own contact 68 and on release of contact 66 of relay WNR. Accordingly, the contacts of relay WRR continue to be picked up and maintain the previously traced circuit for the reverse magnet valve device RMV and the lock magnet valve device LMV.

If while the switch W is in the reverse position the operator desires to effect return of the switch to the normal position, he may do so by pressing on the knob of the normal push button NPB. This closes the contacts I2I3 of the push button, and, assuming that the contacts of reverse route relay RRR are released and that the contacts of the lock relay LR are picked up, completes the pick-up circuit for the winding of the relay NPBSR. This circuit is traced from terminal B of the battery It through Wire I5, contacts I2--l3 of the normal push button NPB, wire I4, winding of relay NPBSR, wire i1, contacts I8-I9 of reverse route relay RRR, wire 2|, contacts 22-23 of lock relay LR, and wire 20 to terminal C of battery I6. The contacts of relay NPBSR accordingly become picked up and contact 45 of the relay interrupts the stick circuit of the Winding of relay RPBSR if it is not already interrupted by contact M of relay RPBSR. In addition, on picking up of contact 28 of relay NPBSR the stick circuit for the winding of this relay is established, while on picking up of contact 46 of the relay NPBSR the circuit for energizing the winding of the normal control relay WNR is complete.

The stick circuit for the winding of relay NPBSR is traced from wire I through push button contact Zia-24, wire 28, contacts 27-48 of relay NPBSR, wire 29, contacts 3Il'3l of relay RPBSR, Wire l4, Winding of. relay NPBSR, wire I1, contacts 58-19 of relay ERR, wir 2!, contacts 22-23 of lock relay LR, and wire 28.

The circuit for energizing the winding of normal control relay WN'R is traced from wire I5 through contacts %41 of relay NPBSR, wire 68, contacts id-53 of relay NRR, wire 53, contacts 5455 of relay LR, wire 52, winding of relay WNR to wire 28.

Since the circuit controlled by the relay NPBSR for energizing the normal control relay WNR includes a back contact of the normal route relay NRR, this circuit can be established only if the contacts of the relay NRR are released. If the contacts of the relay NRR are picked up, the relay WNR will be energized by current supplied over the circuit which is traced from terminal B of battery 16 through wire 85, contacts 5I5il of relay NRR, wire 53, contacts 5 5-55 of relay LR, wire 52, winding of relay WNR, and wire 2th to terminal C of battery it.

On energization of the winding of relay WNR the contacts oi this relay become picked up and when contact 66 is picked. up, it interrupts the stick circuit for the winding of reverse control relay l/VRR and the contacts of relay WRR become released.

On release of the contacts of reverse control relay WRR, contact 68 is moved into engagement with contact T3 to thereby complete the stick circuit for the Winding of relay WNR.

This circuit is traced from wire 55 through contacts Ii-456 of relay WNR, wire 61, contacts 68'I3 of relay WRR, Wire 52, and winding of relay W'NR to wire 2|]. Accordingly when the contacts of relay WNR become picked up, they will thereafter remain picked up until the winding of reverse control relay WRR is energized and effects picking up of the contacts of that relay.

On picking up of the contact IIl'i of relay WNR the circuit for energizing the Winding of relay RWPR is interrupted and contact of relay RWPR becomes released.

On release of contact 90 of relay RWPR connection is established from wire IE to wire 85, While on release of contact 98 or relay WRR connectien is established from wire 86 to wire lit. in addition, on picking up of contact 94 of relay WNR connection is established from Wire 96 t0 Wire 92 leading to the winding of the normal magnet valve device NMV, and this winding thereupon becomes energized.

At this time as the switch W is in the reverse position, current is supplied through contacts I0 and II to the wires I04 and I95, while on release of contact I88 of relay WRR the. circuit for energizing the winding of relay NWPR from the wires I64 and I'85 is "complete, However, the polarity of the current suppliedto the wires IM and IE5 at this time is such that the on;- rent is ineffective to cause picking up of contact 83 of relay NWPR, and this contact, therefore, engages contact 82. Accordingly connection is established from wire I5 to wire 8i so that on picking up of contact 11 of relay WNR the circuit for energizing the winding of the lock magnet valve device LMV is complete. This circuit is traced from wire I5 through contacts 8382 of relay NWPR, wire 8I, contacts a l-ll of relay WNR, wire I5, winding of lock magnet valve device LMV and wire 20.

As the windings of the normal and the lock magnet valve devices are now both energized, fluid under pressure is supplied to the switch motor to move the switch W from the reverse to the normal position. On movement of the switch W away from the reverse position contacts Ill and I I are moved out of engagement with the stationary contacts 91 and I02, respectively, thereby interrupting the supply of current to the supply wires I04 and I05, while on movement of the switch W to the normal position contacts I0 and II are moved into engagement with the contacts I02 and I03, respectively, thereby effecting the supply of current to wires I 64 and I05 of the polarity effective to cause picking up of contact 83 of relay NWPR.

Accordingly this contact of relay NWPR becomes picked up and interrupts the circuit for energizing the lock magnet valve device, and the magnet valve device LMV thereupon prevents further supply of fluid under pressure to the motor for the switch W.

The system provided by this invention is arranged so that if after the switch W has been moved to either of its positions, the contacts of the lock relay LR become released to prevent a change in the position occupied by the switch, the control relay which is energized when the lock relay contacts become released will be maintained energized to maintain the switch in the position which it occupied on release of the lock relay contacts.

If, for exampla'the contacts of the lock relay LR- become released at a time when the winding of the normal control relay WNR is energized, the pick-up circuit for the winding of relay WNR will be interrupted by opening of the contact 55 of the relay LR. The winding of the relay WNR, however, will continue to be energized by current supplied over the stick circuit established by contact 66 of relay WNR and by contact 68 of relay WRR.

Since the winding of relay WNR continues to be energized subsequent to opening of the lock relay contacts, contact 94 of the relay WNR continues to be picked up and maintains the circuit for energizing the winding of the normal magnet device NMV so that in the event the switch W creeps from the normal position, fluid under pressure will be supplied thereto to cause return of the switch to the normal position.

Similarly, if at the time the contacts of the lock relay LR become released the winding of the reverse control relay WRR is energized, the pick-up circuit for the winding of relay WEE will be interrupted by opening of contact 64 of the lock relay LR. The winding of the relay WRR, however, will continue to be energized by current supplied over the stick circuit estab lished by the contact 68 of relay WRR and contact 66 of relay WNR.

Since the winding of relay WRR continues to be energized subsequent to opening of the lock relay contacts, contact 98 of relay WRR is maintained picked up and maintains the circuit for energizing the winding of the reverse magnet valve device RMV so that in the event the switch W creeps from the reverse position fluid under pressure will be supplied to the switch motor to eifect return of the switch to the reverse position.

The system provided by this invention is arranged so that in the event of failure of the source of current the control relay which is energized at that time will become deenergized, and will not thereafter again become energized on restoration of the source of current until a route relay is operated to establish a route control, or until an individual push button is operated.

7 In addition, the system is arranged so that when both control relays are deenergized, the winding of the lock magnet valve device LMV is deenergized to thereby prevent possible supply of fluid under pressure to the switch motor at a time when neither the normal nor the reverse magnet valve device is energized through 68 of relay WRR.

As the winding of relay WNR is energized, the switch W will bein the normal position, while the contact 94 of the relay WNR will be picked up and will establish the circuit of the winding of the normal magnet valve device NMV. At this time the switch W being in the normal position the winding of relay NWPR is energized, and contact 83 of this relay is picked up with the result that even though contact H of relay WNR is picked up no current is supplied to the winding of the lock magnet valve device LMV.

Accordingly the lock magnet valve device LMV prevents the supply of fluid under pressure to the motor for the switch W.

On failure of the source of current the winding of the relay WNR becomes deenergized and the contacts of this relay become released. Contact 66, when released, interrupts the stick circuit for the relay winding so that on restoration of the source of current, the winding of relay WNR will not become energized by current supplied over the stick circuit for the relay winding, but will become energized only if the pick-up circuit for the relay winding is establishedby the normal route relay NRR or by operation of the normal push button NPB.

As the winding of relay WNR remains deenergized, the contacts of this relay remain released, and contact TI interrupts the circuit of the winding of the lock magnet valve device LMV. The winding of the lock magnet valve device LMV, therefore, will remain deenergized and will prevent the supply of fluid under pressure to the switch motor until one or the other of the control relays is energized which will result in energization of one of the other magnet valve devices.

Since the circuit of the lock magnet valve device LMV is complete only when one of the control relays i energized, this circuit will be interrupted on release of the contacts of a control relay as a result of failure of the source of power. Accordingly if for any reason While the contacts of relay WNR remain released, the contact 83 of relay NWPR should become released, the winding of lock magnet valve device LMV will not become energized and fluid under pressure will not be supplied to the switch motor. The supply of fluid under pressure to the switch motor at this time is objectionable since neither the normal nor the reverse magnet valve device is energized.

In similar manner if the failure of the source of current occurs at a time when the reverse control relay WRR is energized, and when the reverse route relay RRR and the stick relay RPBSR are deenergized, the winding of relay WRR will become deenergized, and will not thereafter again become energized until the reverse route relay RRR or the reverse push button stick relay RPBSR becomes energized.

Under the conditions mentioned the reverse route relay WRR will be normally energized by current supplied over the stick circuit established by it own contact 68 and by contact 66 of relay WNR. At this time the switch W will be in the reverse position, while contact 98 of relay WRR will be picked up and will establish the circuit for the winding of the reverse magnet valve device R-MV. As the switch W is in the reverse position, the winding of the relay RWPR is energized and its contact is picked up so that contact 98 of relay WRR does not complete the circuit for the lock magnet valve device LMV.

On failure of the source of current the winding of relay WRR becomes deenergized, and contact $8 of the relay becomes released and interrupts the stick circuit for the relay winding so that on subsequent restoration of the source of current the relay winding will not again become energized and contact 68 will remain released.

On release of the contacts of relay WRR contact 78 of the relay becomes released, thereby interrupting the circuit of the winding of the lock magnet valve device LMV with the result that even if contact 90 of relay RWPR should become released at this time as aresult of the failure of the source of current, or any other reason, the circuit of the winding of the relay LMV will not be complete and current will 'not be supplied to this winding.

It will be seen, therefore, that the lock magnet valve device will be deener'gized in thee'vent of failure of the source" of current, and will not again become energized until one or the other of the control relays is energized, which will result in energization of one of the other magnet valve devices. a

In Fig. 2 of the drawings, 1 have shown a modified form of switch control and indication systern embodying this invention. In thesystem shown in this figure of the drawings a switch control lever L movable between a normal and a reverse position is employed to control the circuits for energizing the normal and reverse control relays which control the motor for the switch W, while a lock stick relay LSR is provided to prevent a change in the position of the switch W when movement of the switch is not safe. The lock stick relay LS R also serves to prevent storage of switch control in the event the position of the switch control lever is altered at a time when the contacts of thelocl: stick relay are released. I

The system shown in Fig. 2 of the drawings is similar to the system shown in Fig. 1 of the drawings and employs normal and reverse control re lays WNR and WRR, respectively, and normal and reverse switch indication or switch repeat ing relays NWPR and RWPR, respectively This system also includes the lock stick relay The relays WNR, WRR, NW'PR,-RVVPR and LSR are of the type having a permanent magnet to assist in maintaining the relay armature in the release position.

The system shown in Fig. 2 of the drawings includes a switch control lever L which'is movable between a normal position N and a reverse posie tion R by an operator to effect movement of the switch W between its normal and reverse positions. The lever L has associated therewith mow able contacts I35! and HI which are movable in accordance with movement of the lever. The contact E30 is connected by wire I33, t'o terminal B of a battery I34, while contact I3! is connected by wire I35 to terminal C of battery I3 i.

When the switch control lever L is in the mor mal position N as shown, contact It?! engages a stationary contact I3t which is connected by wire I3? to contact I33 of lock stick relay LSR. When contact I38 of lock relay LSR is picked up, it engages a stationary contact I39 which is connected by wire Mil to one terminal of the winds ing of normal control relay WNR, the other terminal of which has connected thereto a branch of wire I35 leading from terminal C of battery I34. I

When the lever L is in the reverse position, con tact I33 engages a stationary contact M2 which is connected by wire IM to contact I45 of relay LSR. When contact M5 is picked up, it engages a stationary contact I46 which is connected by wire M8 to one terminal of the winding of the reverse control relay WRR, the other terminal of which has a branch of wire I35 connected thereto.

It will be seen, therefore, that when the contacts of the relay LSR are picked up, a circuit is established to energize the winding of normal control relay WNR when the lever L is in the normal position, and that when the lever L is in the reverse position, a circuit is established to energize the winding of the reverse control relayWRR.

It will be seen that when the contacts of the lock stick-relay LSR are released, the switch control lever L is ineffective to establish a circuit to energize either the normal or reverse switch control relay.

The switch W has associated therewith contacts I 50 and I5I which are movable in accordance'with movement of the switch. The contact I550 has a branch of wire I33 leading from terminal B of battery I34 connected thereto, while contact 'I5I has a branch of wire I35 leading from terminal C of battery I34 connected thereto When the switch W is in the normal position, as shown, contact I50 engages a stationary contact I53 to which is connected supply wire I54, while contact I5I engages a stationary contact I55 to which is connected supply wire I55.

Similarly, when the switch W is in the reverse position, contact I50 engages a stationary contact I58 to which is connected a branch of supply wire I56, while contact I5I engages station- .ary contact I 53 to which is connected supply wire It will be seen that in the normal position of the switch W the contacts I50 and I5I effect the supply of current of one relative polarity from the wires I33 and I35 to the supply wires I54 and I56, while in the reverse position of the switch W the contacts I50 and I5I effect the supply of current of the opposite or reverse relativepolarity to the supply wires I54 and I56.

While the contacts I58 and I5I have been described as engaging the stationary contactsassociated therewith when the switch W is in its normal or its reverse position, it should be understood that it is contemplated that these contacts may operate in the manner well-known in the art so as to engage the stationary contacts associated therewith when and only when the switch not only is in its normal or reverse position, but also is locked in that position.

The supply wire I56 is connected to one terminal of the winding of the reverse indication relay RJ/VPR, and toy one terminal of the winding of the normal indication relay NW'PR. The other terminal of the winding of the relay NWPR is connected by wire I60 to contact I6I of relay WEE. The relay WRR has a movable contact ItZ which when released engages contact IN, and to which is connected supply wire I54. It will be seen, therefore, that the circuit of the winding of the normal indication relay NW'PR is complete when and only when the contact I62 of relay WRR is released.

The other terminal of the winding of the relay RWPR is connected by wire I64 to contact I65 of relay WNR. The relay WNR, has a movable contact I65 which when released engages contact Ito and to which is connected supply wire 154*. It will be seen that the circuit of the winding of the relay RWPR is complete when and'only when the contact 956 of relay WNR is released.

As previously pointed out, the relays NWPR and RWPR are of a type which are responsive to current of one polarity only. The various parts of the apparatus of this system are arranged so that when the switch W is in the normal position, the contacts Iifi'and 555i eiiect the supply of current from the wires I33 and I35 to the supply wires I54 and I55 of a polarity which is effective to cause picking up of the contacts of the relay NWPR.

Similarly, when the switch W is in the reverse position, the switch operated contacts I50 and I5I efiect the supply of current from the Wires I33 and I35 to the supply wires I54 and I56 of a polarity effective to cause picking up or the contacts of the reverse indication relay RWPR.

When the switch control lever his in the normal position, as shown, contact I3I engages a stationary contact 2I0 which is connected by wire 2II to contact 2I2 of relay NWPR, While contact 2I2 when picked up engages a contact 2I4 which is connected by wire 2I5 to one terminal of the winding of lock stick relay LSR.

It will be seen, therefore, that when lever L is in the normal position and the contacts of relay NVVPR are picked up, a circuit is established from terminal C of battery I34 to one terminal of the winding of relay LSR. This pick-up circuit is traced from terminal of battery I 34 through wire I35, lever operated contact I3I, stationary contact 2I0, wire 2, contacts 2I22l4 of relay NWPR, and wire 2I5 to one terminal of the winding of the relay LSR.

When the switch control lever L is in the reverse position, contact I3I engages a stationary contact 2I1 which is connected by wire 2I8 to contact 220 of relay RWPR- Contact 220 when picked up engages a stationary contact 2ZI to which is connected a branch of wire 2 I5 leading to one terminal of the winding of relay LSR.

It will be seen, therefore, that when the lever L is in the reverse position and the contacts of relay RWPR are picked up, a connection is estabing from terminal C of battery I34, while coni tact 223 when picked up engages a contact 225 to which is connected a branch of wire 2 I5 leading to a terminal of the winding of the stick relay LSR. It will be seen, therefore, that when the contacts of the relay LSR, become picked up, contact 223 establishes a stick circuit for the windin of the relay LSR to maintain the winding energized on interruption of either of the pick-up circuits for the relay winding.

The other terminal of the winding of the relay LSR is connected to terminal B of battery I34 by means of a circuit which is controlled by contacts 221 and 228 of locking relays, not shown. The circuits of the windings of the locking relays may be controlled in any suitable manner well-known in the art so that the contacts of these relays will be picked up when and only when it is safe to effect movement of the switch W between its two positions. It will be seen that the circuit of the winding of the lock stick relay LSR can be completed when and only when the contacts 221 and 228 are picked up, and that .when these contacts are released, the winding of relay LSR. is deenergized and cannot be energized by current supplied either over the pickup circuits or over the stick circuit.

The system shown in Fig. 2 of the drawings is shown with the control lever L and the switch W in their normal positions, and with the lock stick relay LSR energized. As the lever L is in the normal position, the winding of the normal control relay WNR is energized, and as the switch W is in the normal position, the winding of the normal indication relay NWPR. is energized.

The winding of the normal control relay WNR is energized over a circuit which is traced from terminal B of battery I34 through wire I33, lever operated contact I30, contact I35, wire I31, contacts I38-I39 of relay LSR, wire I40, winding of relay WNR and wire I to terminal C of battery I34.

The stick circuit for the winding of relay WNR is also complete and. is traced from wire I33 through contacts I1l--I10 of relay WNR, wire I12, contacts I13I14 of relay WRR, wire I40, winding of relay WNR and wire I35.

As the winding of relay WNR is energized, the contacts of the relay are picked up and contact I98 engages contact I96 to establish the circuit to energize the winding of the normal magnet valve device NMV. The circuit for energizing this magnet valve device is traced from wire I33 through contacts I94-I92 of relay RWPR, wire I9l, contacts 20320I of relay WRR, Wire 200, contacts I98I96 of relay WNR, wire I95, winding of magnet valve device NMV, and wire I35.

At this time the contact I8I of relay WNR is picked up and engages contact I84 to establish connection from wire I85 to wire I80 leading to the winding of the lock magnet valve device LMV.

At this time, however, contact I88 of relay NWPR is picked up and does not establish connection from wire I33 to wire I85, and hence the winding of the lock magnet valve device LMV is not energized, and no fluid under pressure is supplied to the motor for the switch W.

At this time, as the switch W is in the normal position, the switch operated contacts I and I5I effect the supply of current of a polarity effective to cause picking up of the contacts of relay NWPR to the'supply wires I and I 55, While, since contact I62 of relay WRR is released, it completes the circuit for the Winding of relay NWPR. The energizing circuit for the winding of relay NWPR includes wire I54, contacts I02-I6I of relay WRR, wire I 60, winding of relay NWPR, and Wire I55. The contacts of the relay NWPR, therefore, are picked up.

As contact 2 I 2 of relay NWPR is picked up, and as the lever L is in the normal position, one pickup circuit for the winding of relay LSR is established. This circuit is traced from terminal C of battery I34 through wire I35, contact I3I, contact 2I0, wire 2, contacts 2I22I4 of relay N'WPR, wire 2I5, winding of lock stick relay LSR, lock relay contacts 221 and 228, and Wire I33 to terminal B of battery I34.

As the winding of lock stick relay LSR is energized, contact 223 of the relay is picked up and establishes the stick circuit for the relay winding.

If at this time the locking relay contact 221 or 228 should become released, the winding of the relay LSR will be deenergized and the contacts of the relay will become released. On release of contact I38 of relay LSR the pick-up circuit for the winding of relay WNR is interrupted, but the winding of this relay continues to be energized by current supplied over the stick circuit established by its own contact I10 and by contact I62 of relay WRR. Accordingly the relay winding will continue to be energized and the contacts of the relay will be picked up, and contact I98 will maintain the circuit for the winding of the. normaltmagnet valvedevi'ce 'NMV.

on subsequent picking" up of the locking. relay contact 221 or 228'.the*circuit of thewinding of the relay LSR willagain'cbe complete, and this tact I88 of this relay will become'"released'and J will establish the'circuit for energizing the winding of the lock magnet valve device LMV. i This valvedevice will thereupon effect'thesupply of fluid: under pressure to the motorsfor'th'e :switch W, and since the normal magnet valve device NMV is energized, the fluid 'suppliedito the switch motorwill i cause ithe"switch W to "be returned" to the normal position;

When the switch W attains the normal position, contacts I50 and Ilfi'l i'willi'conrplete thecircui-t' for supplying current" to thersupply writes I 54 and I 56; 'and the winding' of-xrelay 'NXVPR will again be energized andits contact "I 88 will 'again become'xpicked up. On'picking up of contact I88 the winding'of lock magnet 'valvedevice' LMV is deenergized, and this valve device [cuts off the further supply of fluid under pressureto the switch motor.

If at this: time :the operator desires-to effect movement of the switch -W'from the normal to the reverse po'sition, he may doso by: moving the 'COHUIOFIEVBKL from the normal to the reversep'osition.

On. movement of the control: lever L away from theinormal po-sition'contact I31 interrupts the previously traced: pick up circuit for the winding of'the IOckStickreIay LSR;but this relayis "maintained energized: by current supplied over the stick'circuit established by its own'con tact 3223'.

On movement of contact I30 out'ofengagement with contact I36 the:previously traced pick-up circuit :fOl the :winding ofrelay is interrupted; but the winding'of this: relay is maintained energized at this time by current suppliedover-the stick "circuit established-by contact-I10 of relayWNR andcontact Il'3 'f relay WRR.

On movement of lever operated contact -I39 into engagement with contact 142- the pick-up circuit for the'winding of relay WEB/is complete. This circuit is traced from terminal B of battery I34 through wire I33; contact I33, contact 142; wire I44; contacts 'Iflii -MB of relay LSR, wire idty winding'of relay WRR,-and wire l 35wt'o terminal C of battery I34.-

On'energization'of the winding-oi relay WRR the contacts of this relay become picked up, and on 'picking upof contactIH-cfthe relay, the

previously traced stick cincuitfor' the winding ofrelay' WNR'is interrupted and this winding thereupon becomes *deenergized, while a the contacts of'relayWNR; become released-y O n -picking up of the'contaetsof rel-ay' WRR and 'release of the-contacts of relay" WNR a stick circuit is established for maintaining the winding of relay WRR energized. "This circuit is traced from wire I33 throughcontacts 113-413 of relay.WRR; wire I 52, contacts IlQ'-I'IB of relay WNR, and/wire M8-to one terminal oi the "winding of relay-WR-R', the other terminal of previously traced circuitfor energizing the winding of normal magnet valve device NMV is interrupted-while on picking up of the contact 2M of relay WRR the circuitfor energizing the winding of the reverse magnet valve'device RMV is complete. This circuit is traced from wire 1-33 through contacts I88il8ii' of 'relay NWPR; wire I85,.Icontacts I9I'-'-I98"of relay wire-20B, contacts 29I' 2ilBIof relay WR R,',wire fi l/winding of reverse-magnet valve device RM-V and wire I 35 to terminalC of battery'I3' I;

At this time the winding of the relay N'WPR is deenergized and its contact I88 is released since the circuit ofthe winding of the relay'became interrupted on picking up of contact I62 'of-relay WRR. 4

On release of contact Ifitofrr'elay WNRdhe circuit of the winding of the relay RWPR-is com-- plete, but at this time the polarity of the current supplied through: contacts I and I5I to the supply wires I54 and I5$-is not suchas to cause picking up ofthe contacts of'relay RWPR. In-

stead the current supplied to the supply wires 454 and I56 is of-a polarity .which-cau'ses-the' contacts of the rel-ayRWPR to beheld in their open-positionswith added force.

On picking up of contact I83 of relayWR-Rthe circuit of the winding of the lock magnet-valve device-LMV is complete and this valve device effects the supply of fluid under pressure to-the switch motor W. A's'the winding of the reverse magnet valve device'RMV is energized atthis time, as=explained above, the switch motor is operated toeflect movement of the switch W from the normal to the reverse position;

The-circuitfor energizing the winding of :the lock' magnet valve device LMV is traced from wire I33 through" contacts IN-492 "of relay RWPR,-wire I 9 I, contacts I 98-4 830i relay WRR, wire I80, winding of lockvmagnet-valve device LMV-,and wire E35'to terminal '6 of battery 134.

When the switch-W reachesthe reverse position,-' contacts I50 and I5I effect'thesupplyof current to the wires "I54 and 156' of a polarity effective to cause picking up ofthe contacts "of relay RWPR'. On pickingup of contact 194-01 this relaythe previously traced circuit for energizing the :lock magnet valve device LMV is: interruptedyand this valve device thereupon operates to prevent the further supply of iiuid'under pressure'to the motor for the switch W l At'this time the previously traced-circuitffor energizing the winding of the reverse magnet valve device RMV continues to be established so that the winding-of this-valve device is main- 'tained energized; Accordingly; if for any reason the switch W should creep from itsreverseposition with the result that the winding of relay RWPR becomes deenergized and its contact-I84 becomes released so that the winding of the lock magnet valve device LMV again becomes energized, fluid under pressure will be supplied -to the motor for the switch W to cause the motor to return the switch tothe reverse position. When the switch again-occupies the reverseposition, the winding of relay RWPR will again be energized and its-contact I94 will be picked up and will interrupt the circuit of the winding-of the lock magnet valve device LMV which "will operate to cut off the further supply of fluid under pressure to the motor forthe switch When contact 220 of relay RWPR is picked up, it completes a pick-up circuit for the winding of the lock stick relay LSR, but at this time this winding is already energized by current supplied over the stick circuit established by the relay contact 223.

If while the relay WRR is energized and the switch W is in the reverse position the lock stick relay LSR should become deenergized because of opening of one of the locking contacts 221 or 228, contact I45 of relay LSR will interrupt the pick-up circuit for the winding of relay WRR, but the winding of the relay WRR will continue to be energized by current supplied over the stick circuit established by contact II3 of relay WRR and by contact III) of relay WNR.

Accordingly, the contacts of relay WRR will be maintained picked up and contact I will establish the circuit for energizing the winding of the reverse magnet valve device RMV, while contact I83 establishes connection from Wire I9I to wire I80 leading to the winding of the lock magnetvalve device LMV. As a result the winding of the lock magnet valve device LMV will be energized in the event the switch W should creep from the reverse position and cause deenergization of the relay RWPR. As the reverse magnet valve device RMV is also energized, fluid under pressure will be supplied, as explained above, to the motor for the switch W to return the switch to the reverse position.

' The lock stick relay LSR. operates when its contacts are released to prevent a change in the position of the switch W. When the contacts of the relay LSR are released, contact I38 interrupts the pick-up circuit of the relay WN R, while contact L45 interrupts the pick-up circuit of the relay WRR. W'hichever one of the control relays is energized at the time the contacts of the lock stick relay LSR become released will be maintainedenergized by current supplied over 'the stick circuit for that relay.

Furthermore, as long as the contacts of the lock stick relay LSR remain released the other one of the control relays cannot be energized 's incethe pick-up circuit for the winding of that relay is interrupted by the contacts of the lock stick relay. Accordingly, as long as the contacts of relay LSR remain released no change can be effected in the position of the switch.

On subsequent picking up of the contacts of the lock stick relay LSR the pick-up circuits of the control relays are again under the control of the operator, and the circuit for either of the relays may be established by operation of the 'switch control lever L in the manner explained above;

The lock stick relay LSR also operates to prevent storage of switch control, that is, to prevent movement of the switch W in response to movement of the switch control lever L at a time when the contacts of the lock stick relay LSR are released,

For purposes of illustration it will be assumed that the contacts of the lock stick relay LSR be come released at a time when the switch control le'ver L and the switch W are in their normal positions, and that while the contacts of 'the'lock stick relay LSR are released, the lever L is moved from the normal to the reverse position, after which the contacts of the relay LSR become picked up.

As the switch control lever L is assumed to be in the normal position, the winding of relay WNR will be energized, while the winding o established for the winding of the relay LSR,

this circuit being traced from terminal C of battery I34 through wire I35, contact ISI, contact 2H), wire 2, contacts 2i22I4 of relay NWPR, wire 2I5, winding of relay LSR, locking relay contacts 221 and 228, and Wire I33 to terminal B of battery I34.

The above traced pick-up circuit is interrupted, however, on opening of one of the locking contacts 227 or 228. In addition, the stick circuit which includes contact 223 of relay LSR is also interruptedrwhile contact 223 becomes released on deenergization of the relay winding.

On deenergization of the winding of the lock stick relay, the contacts I38 and I45 become released and contact I38 interrupts the pick-up circuit for the winding of relay WNR, but this winding is maintained energized over the previously traced stick circuit.

If the switch control lever L is now moved to the reverse position, contact I30 is moved into engagement with contact I 42, but does not affect the supply of current to the winding of relay WRR since contact I45 of relay LSR. is released.

In addition, on movement of the control lever L to the reverse position contact I3I is moved into engagement with contact 2II, but this contact does not establish a pick-up circuit for the winding of relay LSR at this time since contact 220 of relay RWPR is released and does not establish connection from wire 2H3 to wire 2I5. The winding of relay RWPR is deenergized at this time since contact I66 of relay WNR is picked up. Furthermore, since the switch W is in the normal position, even if contact I65 of relay WNR should become released, the polarity of the current supplied to the supply wires I 54 and I 56 is not such as to cause picking up of the contacts of relay RWPR.

If, while the control lever L remains in the reverse position, the locking relay contact 22'! or 228 which was released and which interrupted the circuit of the winding of the lock stick relay LSR should become picked up, no circuit will be established to effect energization of the winding of the relay LSR.

The stick circuit for the winding of relay LSR is interrupted since contact 223 is open, and this contact will not become picked up until the relay winding is energized by current supplied over one of the pick-up circuits.

As the control lever L is in the reverse position, contact ISI does not establish connection from wire I35 to wire 2 I I, and hence even though contact 2I2 of normal indication relay NWPR is picked up, current is not supplied through this contact to the wire 2 I5 leading to the wind- I ing of the relay LSR.

to the. normal position, contact l 3 I will engage contact 21 0 so that a circuit is completed to 1 energize-the winding of the-relay'LSR; and when this wind-ing isenergized; contact 223 becomes picked up and establishes a stick circuit for the relay windingto maintain 'it energized until one of a the locking relay contacts is subsequently released.

on this ipicking up of the contacts cf-the'relay LSRJthe contacts I38 and ldi reestablish 'the'- pick-up circuits for the control-relays wNRi and WRR-and the equipmentis again under 'the control of the operatorwho may efiect movement'of 1 the switch W in "the .usual mannerby movement of-the switch control-lever L.

The system-operates in a similar manner it the contacts of the relay-LSR become released'at "a time when the control lever B and the switch W are in the reverse position-pand'i-f while the. conta'ctsof the relay LSR are releasedthe control lever L is moved trommhe reverse 'to'the normal position.

Under such circumstances neither-pickup circuit for the winding of the-relay LSR-w-ill be established-until the control lever-L is returned toithe reversaposition, whereupon the winding of the relay LSR; "will become energized, provided the locking relay contacts are picked-up; a-ndthe contacts of the relay'LSR 'will becomepicked up to restore control of the switch W to the operatorxas previously explained.

In Fig. 3 of the drawingsl have shown a modifled form of system whichI may-employin con- 1 nection'withzthe systems shown in Figs. 1 and 2 of the drawings to control-an electric or-other' typeof switch motor by'means of a polarized relay or other device which'is select-ivelyrespomsive to 'th polarity ofthe current supplied-there to; I

Referring to Fig. '3 of the drawings; there-is shown therein a fragment ofthe system which includes normal and reverse control relays WNR and-WRRand normal and-reverse switch indication orswitch repeating-relaysNWPR and RWPR. F The circuits of the windings-0f these relays maybe controlled in the manner shown in'Fig. -1 or 2 ofthe drawings; while these relays are of the type having a permanent magnet for maintaining the relayarrn-ature in 'its released position.

The system shown'in Fig; "3, except as hereinafter pointedout in detaiL-is the same as the corresponding systems shown in.Fig". 1 or Fig. 2 of the drawings. The system shown i'niFi'g; 3 does not have the circuits shown-in-Figs. 1 and 2 and controlled by the normal and reverse control relays'and also by the "normal and reverse indication relays for controlling energization of the windings ofthe' magnet valve devices it such devices areemployed'.

The system shown in Fig. 3 includesa polarized relay X or equivalent device responsive to the "polarity of thecurrent supplied thereto to control t-he circuits of theswitch motor, not shown,

inany manner well-known in the'art. As shown the relay X has a neutral' contact 230 which is picked up when the relay winding is energized with current of either relative polarity. The

- contact ZSFJ'Whenpickedup engages a stationary contact 231130 which is connected'a control wire 232', while the contact 230 is connected by wire 2 3'4 'with polar contact '2-35-of the relay. The

polar contact 235-whe'n in its-normal position,

as shown eng-agesnormal polar contact 236 to Which is connected control wire'23lfwhilethe 2.39; Furthermoreywhen the winding .of the; re-

' polar :contact 235,1'when in.'therreverseeposition, engages I reverse polar .contact 238 J to which is connectedcontrol' wire239 Itwil'l .be seen, :therefore, that when the winding .ofrel'ay X is energized: with currentzofone relative polarity, vrcontact :23!) is picked up and connection is established from control wire 232 to wire 2311, while. when :the .relay .3! is energized with 'curre'nta'rof the opposite relative polarity, connection. is established. between wires .232 and layuXiis not energized, the neutral contact 230 is released andLno connection is establishedifrom wire 232 to L either. of? the other control wires.

. The control. "wires 232; 23l' and 23'9'control. the

'2 to movable contact'245 of reverse indication relay. JRWPR; Contact 245 when released engases :a stationary contact? which is connected by Wir'TZ'Q-B' VO contact 249 of'reverse control relay WR'R', while the relay WRR' has a movable contact 250 which when-- released. engages the contact 1249; The contact 250' has' connected xtheretooontrol wire 2'5l leading to one terminal ofthewinding of polarized relay .X.

Contactflfl ofrelay. WNR when released ongages: .a contact 153- which is connected by wire 254 to contact '255 of' normalindication relay NWPR. Contact 255 when released engages a stationarycontaot 251which is connected'by wire '2 58 to-"contact 2'60: of relay 'WRR. The'relay WRR-has-sa movable contact 262 to which is connected-control wire 263 leading to one terminal ofzthe winding of the polarized relay X.

The contact 242 of relay WNRwhen' picked up zengages "a stationary contact-26lwhich is connectedrby'wire 265-130 contact 265' of relay WRR', fwhil'e'contact 266- is' engaged by contact 262 whencontact 262is releaseoL- The contact 242 of relay WNR when released engages -a stationary contact 268which 'is connected: by 'wire 269*to contact 210 of relay WRR. The: contactlfill'of relay WRR 'when picked up engages contact 219. i

It will be seen that the circuits just described I are arranged so that when the contacts of nor- -mal-=controlurelay- WNRare-picked up, and the contacts-"of reverse control relay WRR and reverseindication'relay RWPR are released; a circuit' is established to supply current of one relative' polarity from-terminals B and C of the source of current to thecontrol wires 251' and 2 53 leading to the winding of the polarized relay The-.circuit-from terminal B of the-source 'of current: to control wire 25-! is traced through contacts 240'243-'0f relay WNR, wire 244, contacts 2 i5-=2 l-11of relay .RWP-R, wire M3; contacts 249'2553 -of relay WRR, an'd'wire 251 leading to one terminal of the winding of relay X.

' The" circuitfrom-terminal C of the source of current to control wire 2S3 is traced through contacts 242-464 of relay WNR, wire 265-, contacts 2.56426? of relay W'RR, and wire. 253 to'the other terminal of'fth'e relayX.

'It will be seen that at this time the winding of the polarizer relay X is energized'with current of one relative polarity, which may be considered as normal relative polarity, with the result that the relay conditions the .motor, not shown, controlled thereby to effect movement of the switch to the normal position.

In addition, it will be seen that when the contacts of relay WRR are picked up and the contacts of relays WNR and NWPR are released, cur rent of the opposite or reverse relative polarity is supplied to the control wires 25I and 263.

Under these conditions, connection is established from terminal B of the source of current to control wire 263 over a circuit which includes contacts 240-253 of relay WNR, wire 254, contacts 255-251 of relay NWPR, wire 258, and contacts 260-262 of relay WRR to control wire 263 leading to one terminal of the winding of relay X.

In addition, connection is established from terminal C ofthe source of current to control wire 25I over a circuit which includes contacts 242-268 of relay WNR,wire 269,contacts 210-250 of relay WRR, and wire 25I to one terminal of the winding of relay X.

It will be seen that at this time current of a different polarity is supplied to the control wires 25I and 203 with the result that the contacts of the polarized relay X effect control of the motor, not shown, for the switch W to move the switch to the reverse position.

In Fig. 4 of the drawings there is shown a modification which I may incorporate in the system shown in either Fig, 1 or Fig. 2 of the drawings to provide additional insurance that the indication relays NWPR and RWPR are energized only when it is intended that they should be energized.

In the systems shown in Figs. 1 and 2 of the drawings the supply of current from the switch operated contacts I and I I to the winding of the indication relay for each position of the switch is controlled by the control relay for the other position of the switch.

Thus the circuit of the winding of the relay NWPR is controlled by a contact of the relay WRR so that this circuit is complete when and only when the contacts of relay WRR are released.

Similarly, the circuit of the winding of the relay RWPR is controlled by a contact of relay WNR so that this circuit is complete when and only when the contacts of the relay WNR are released.

The modification shown in Fig. 4 of the drawings is arranged so that the winding of the indication relay for each position of the switch will be energized only when the control relay for that position of the switch is energized, and when, in addition, the control relay for the other position of the switch is deenergized.

In the modification shown in Fig. 4 of the drawings the same reference characters are employed in the description and in the drawings as are employed in connection with the system shown in Fig. l of the drawings to identify the parts which are common to both systems. It should be understood, however, that the modification shown in Fig. 4 of the drawings may be incorporated in the system shown in Fig. 2, or in the modificationshown in Fig. 3, as well as in the system shown in Fig. 1.

In the system shown in Fig. 4 of the drawings one terminal of the winding of the normal indication relay NWPR has a branch of supply wire I04 connected thereto, while the other terminal of the winding of the relay NWPR. is connected by wire H3 to contact H2 of reverse control relay WRR. The relay WRR has a contact I08a which when released engages contact II 2, and which is connected by a wire 280 to contact I 01a of normal control relay WNB. Contact I0'Ia of relay WNR when picked up engages a contact 28I to which is connected supply wire I05.

It will be seen that when the contacts of control relay WNR are picked up and the contacts of control relay WRR are released, a circuit is established from the supply wires I04 and I05 to energize the winding of the relay NWPR. This circuit is traced from wire I05 through contacts 28I-I0Ia of relay WNR, wire 280, contacts I08arII2 of relay WRR, wire H3, winding of relay NWPR, and wire I04.

It will be seen, therefore, that the winding of the relay NWPR can be energized from the supply wires I 04 and I05 only when the control relay WNR is energized and When the control relay WRR is deenergized.

One terminal of the winding of the reverse indication relay RWPR has supply wire I04 connected thereto, while the other terminal of this winding is connected by wire I I0 to contact 283 of relay WNR, while contact 283 is engaged by contact I0'Ia when contact I0'Ia is released.

The contact I08a of relay WRR when picked up engages a contact 205 to which is connected a branch of supply wire I05.

It will be seen that the winding of the relay RWPR is energized from the supply wires I04 and I05 when the contacts of relay WNR are released and the contacts of relay WRR are picked up. The circuit for energizing the winding of the relay RWPR is traced from wire I05 through contacts 285-l08a of relay WRR, wire 280, contacts I Illa-283 of relay WNR, wire H0, winding of relay RWPR, and wire I04.

It will be seen, therefore, that the winding of the reverse indication relay can be energized from the supply wires I04 and I 05 only when the contacts of the reverse control relay WRR are picked up and the contacts of the normal control relay WNR are released.

The system shown in Fig. 1 of the drawings, when altered to incorporate the modification shown in Fig. 4, operates in substantially the same manner as the system shown in Fig. 1, and a detailed description of the operation of the system is unnecessary.

When the modification shown in Fig. 4 of the drawings is incorporated in the system shown in Fig. 2, the system as modified operates under normal conditions in the same manner as the system shown in Fig. 2, and a detailed description of the operation under normal conditions is unnecessary.

' However, when the system shown in Fig. 2 is modified as taught in Fig. 4, it operates somewhat diiferently than the system shown in Fig. 2 in the event of failure of the source of current.

In the system shown in Fig. 2, in the event of failure of the source of current, the control relays WNR and WRR are both deenergized, and contact I56 of relay WNR establishes the circuit of the winding of relay RWPR, while contact I62 of relay WRR establishes the circuit of the winding of relay NWPR. On restoration of the source of current, therefore, the contacts of one or the other of the indication relays will become picked up, and will establish a pick-up circuit for the winding of lock stick relay LSR so that the contacts of relay LSR will become picked up, thereby'restoring the system to the condition it was in priorto the failure of the source of current.

When the system shown in Fig. 2 is modified as shown in Fig. 4, on failure of the source of currentand resultant release of the contacts of both control relaysWNR and WRR, the circuits of the windings of both indication relays NWPR and RW'PR are interrupted and" the contacts of both of these relays are released.

As aresult of the failure of the source of current, the winding of the lock stick relay LSR is deenergized, and its contacts are released and interrupt. the pick-up circuits for the control relaysWNR and WRR, while contact 223 of relay LSR interrupts the stick circuit for the winding of. relayLSR. On failure of the source-of power, therefore, the contacts .of the control relays. interrupt the circuits of the windings of the indication relays, the contacts of the indication relaysinterrupt the pick-upclrcuitsof the windingof the lock stick relay LSR, and the contacts of the relay LSR interrupt the pick-up circuits. of. the windings of the control relays WNR. and WRR.

Qnsubsequent restoration of the source of current. all of these relays will remain'deen'ergized unless some supplementarymeans is provided to energize. at least oneof them.

This condition can be taken care of by providing emergency means for establishing connection. from terminal B of battery 134' (see Fig. 2.). to wire 2l5 so that the winding of the relay LSR willbecome energized if the locking relay. contactsZZl and 228 are picked up. On such energization of the winding of the-relay LSRthe contactsof the relay become picked up, and thepick-up circuit for one of the control relays is. established, the'particular one-dependinguponthe position occupied by the switch control lever L. On energization of the winding of one of. the .controlrelays; the contacts of this relay becomepicked up and complete the'circuit for energizing the winding of one of the indicationrelays, whereupon the contacts of that indication relaybecorne' picked up and complete a pick-,upcircuit for the winding of the lock stick relay. .In l addition, the stick circuit for the winding of the lock stick relay LSR. is established by means of the contact 2230f the relay which becomespicked-up on energization of the relay winding.

The equipment is now restored to its original condition and the operator may effect movement" of the switch'W. in the usual manner byoperation, of the switch control lever L.

Itmay be desired to employ rectified current supplied from a commercial source of alternating current instead of direct current from a battery for normal operation of the system provided by this invention, and to provide a power-off relay operative in the event of failure of the commercial source of alternating current to establish connection from an emergency source of current, such as a battery.

A power-off. relay of this type requires a short timeinterval for its operation, and hence there is a briefperiod between the failure of the normal source. of current and the supply of current from the emergency source.

In order to prevent undesired release'of the contacts of the control relays and WRR under; .these conditions these relays may'be made slow; acting; so that *they will bridge over the momentary period during transfer from one source of energy to the other. 7 Although I have herein shown and described only four forms of switch control and indication systems-embod-ying my invention, it is understood-that various changes and modifications may bemade therein within the scope of the appended claimswithout departing from the spirit and scope of my invention.

Band-only when the relay winding is energized with current of. a-particular polarity, a pair-of supply conductors through which current may be supplied to the windings of said indication relays,1one: of the-said indication relays being arsrangedso that its contacts become picked up when the relay: winding is energized from said conductorstat a time when current of one relativepolarity is supplied to said conductors, the other. of saidindication relays being arranged tsothat its contacts become picked up when .the

relay'windingis energized from said conductors at a1time.-.when;current of the opposite relative polarity is supplied to said. conductors,v means governed in accordance with the. position oc- 'Icupiedby. theswitclr for supplying current of one polarity or theotherto said supply conductors, acontact of'the normalv control relay controlling the circuitforenergizing the winding of the reverse indication relay from said supply coniductors, a contact of the reverse control relay controlling the circuit for energizing the winding of the normal indication relay from saidsupply conductors, andmeans controlled by said control relays and also by said indication relays for gwcontrolling said motor.

2. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a normal and a reserve control relay, means for selectively .mfienergizlng the winding of one or the otherof said 55ificurrentof aparticular polarity, a pair of .supply conductors through which current may be supplied to the windings of said indication relays, one of said indication relays being arranged so that its contacts become picked up when the relay" winding is energized from said conductors at a time when current of one relative polarity is supplied to said conductors, the other of said indication relays being arranged so that its contacts becomepicked up when the relay winding is energized from said conductors at a time when ourrentof the opposite relative polarity is supplied to said conductors, means governed in accordancewwith the position occupied by the :switchrfor supplying current of one polarity or the otherto said supply conductors, the circuit for energizing the winding of each of said indication relays from said supply conductors being controlled by contacts of both of said'control -relays and-means controlled by said control relays and also by said indication relays for controlling said motor.

3. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a normal and a reverse control relay, means for selectively energizing the winding of one or the other of said control relays, a normal and a reverse indication relay, said indication relays being of a type the contacts of which become picked up when and only when the relay winding is energized with current of a particular polarity, a pair of supply conductors through which current may be supplied to the windings of said indication relays, one of said indication relays being arranged so that its contacts become picked up when the relay winding is energized from said conductors at a time when current of one relative polarity is supplied to said conductors, the other of. said indication relays being arranged so that its contacts become picked up when the relay winding is energized from said conductors at a time when current of the opposite relative polarity is supplied to said conductors,

means governed in accordance with the position occupied by the switch for supplying current of one polarity or the other to said supply conductors, the circuits for energizing the winding of each of said indication relays from said supply conductors being controlled by contacts of both control relays, the circuit for energizing the winding of the normal indication relay being complete only when the contacts of the .normal control relay are picked up and the contacts of the reverse control relay are released, the circuit for energizing the winding of. the reverse indication relay being complete only when the contacts of the reverse control relay are picked up and the contacts of the normal indication relay are released, and means controlled by said control relays and also by said indication relays for controlling said motor.

4. In combination, a railway track switch movable between a normal and a reverse position, a fluid pressure motor for moving said switch, a lock magnet valve device operable only when imergized to permit the supply of fluid under .pressure to said motor, a normal magnet valve device operable when energized to control the supply of fluid by the lock magnet valve device to the motor to cause the motor to move the switch to the normal position, a reverse magnet valve device operable when energized to control the supply of fluid by the lock magnet valve device to the motor to cause the motor to move the switch to the reverse position, a normal and a reverse control relay, a normal and a reverse indication relay, means for selectively energizing one or the other of the control relays, means governed in accordance with the position of the switch and controlled by said control relays for energizing said indication relays,.means operable when the normal control relayis energized and the normal indication relay is deenergized for energizing the winding of the lock magnet valve device, means operable whenthe reverse control relay is energized and the reverse indication relay is deenergized for also energizing the winding of the lock magnet valve device, means operable when the normal control relay isenergized to energize the winding of the normal magnet valve device, and means operable when the reverse control relay isenergized to energize the winding of the reverse magnet valve device. 7

5. In combination, a railway track switch movable between a normal and a reverse position, a

fluid pressure motor for moving said switch, a lock magnet valvedevice operable only when energized to permit the supply of fluid under pressure to said motor, a normal magnet valve device operable when energized to control the supply of fluid by the lock magnet valve device to the motor to cause the motor to move the switch to the normal position, a reverse magnet valve device operable when energized to control the supply of fluid by the lock magnet device to the motor to cause the motor to move the switch to the reverse position, a normal and a reverse control relay, a normal and a reverse indication relay, means for selectively energizing one or the other of the control relays, means governed in accordance with the position of the switch and controlled by said control relays for energizing said indication relays, means operable when the normal control relay is energized and the normal indication relay is deenergized for energizing the winding of the lock magnet valve device, means operable when the reverse control relay is energized and the reverse indication relay is deenergized for also energizing the winding of the lock magnet valve device, means controlled by both control relays and by the reverse indication relay for energizing the winding of the normal magnet valve device, and means controlled by both control relays and by the normal indication relay for energizing the winding of the reverse magnet valve device.

6. In combination, a railway track switch movable between a normal and a reverse position, a fluid pressure motor for moving said switch, a lock magnet valve device operable only when energized to perm-it the supply of fluid under pressure to said motor, a normal magnet valve device operable when energized to control the supply of fluid by the lock magnet valve device to the motor to cause the motor to move the switch to the normal position, a reverse magnet valve device operable when energized to control the supply of fluid by the lock magnet valve device to the motor to cause the motor to move the switch to the reverse position, a normal and a reverse control relay, a pick-up circuit and a stick circuit for each control relay for energizing the winding of such relay, means for selectively supplying currentto said pick-up circuits, the stick circuit for each relay being controlled by contacts of both control relays, the stick circuit for each control relay being complete when and only when the contacts of that relay are picked up and the contacts of the other control relay are released, a lock relay governed by traiiic conditions in the vicinity of the switch and controlling the pick-up circuits of both of said control relays, a normal and a reverse indication relay, means governed in accordance with the position of the switch and controlled by said control relays for energizing said indication relays, means operable when the normal control relay is energized and the normal indication relay is deenergized for energizing the winding of the lock magnet-valve device, means operable when the reverse control relay is energized and the reverse indication relay is deenergized for also energizing the winding of the lock magnet valve device, means operable when the normal control relay is energized to energize the winding of the normal magnet valve device, and means operable when the reverse control relay is energized to energize the winding of the reverse magnet valve device.

7. In combination, a railway track switch movable between a-normal and a reverse position, a

ayeinoes motor for moving said switch, a normal and a reverse control relay, means for selectively energizing the winding of one or the other of said controlrelays, a normal and a reverse indication relay, means governed in accordance with the position of the switch for energizing said indication relays, a polarized relay operable according as its winding is energized with current of one .or the other polarity to condition the motor to move the switch to one positionor the other, means operable when the normal control relay is energized provided the reverse control relay and lthereverse indication relay are both d'eenergized for supplying the winding of the polarized relay with current of one relative polarity, and means operable when the reverse control relay is energized provided the normal control relay and the normal indication relay are both deener-' gized for supplying the winding of the polarized relay with current of the opposite relative polarity.

8. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a normal and a reverse control relay for controlling said motor, a pick-up and a stick circuit for each control relay for energizing the winding of that relay, control mechanism for selectively supplying cur-' rent to the pick-up circuit for either of said control relays, the stick circuit for each control relay being controlled by contacts of both control relays, the stick circuit for each control relay being complete when the contacts of that relay are picked up and the contacts of the other control relay are released, a lock relay operable when its winding is energized to permit the pick-up circuits for the control relays to be established and to establish a stick circuit for energizing its own winding, a normal and a reverse indication relay, means governed in accordance with the position of the switch and also controlled by said control relays for energizing said indication relays, a pick-up circuit for energizing said lock relay winding, said circuit being controlled by said control mechanism and by one oi said indication relays, another pick-up circuit for energizing said lock relay winding, said circuit being controlled by said control mechanism and by the other one of said indication relays, and means governed in accordance with trafiic conditions in the vicinity of the switch and controlling the pick-up and stick circuits for energizing the lock relay wind- 9. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a normal and a reverse control relay for controlling said motor, a pick-up and a stick circuit for each control relay for energizing the winding of that relay, the stick circuit for each of said relays being controlled by contacts of both control relays, the stick circuit for each control relay being complete when the contacts of that relay are picked up and the contacts of the other control relay are released, a lock relay operable when its winding is energized to permit the pick-up circuits for the control relays to be established and to establish a stick circuit for maintaining its own winding energized, a normal and a reverse indication relay, means governed in accordance with the position of the switch and also controlled by said control relays for energizing said indication relays, a first and a second pick-up circuit for energizing the lock relay winding, said first pick-up circuit being complete only when the normal indication relay is energized, said second pick-up circuit being A cuit for the normal control relay and the first pick-up circuit for the lock relay winding, said control mechanism also having a reverse condition in which it establishes the pick-up circuit for the reverse control relay and the second pickup circuit for the lock relay winding, and means governed in accordance with trafiic conditions in the vicinity of the switch and controlling the pick-up circuits and the stick circuit for the lock relay winding.

10. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a normal and a reverse control relay, a pick-up and a stick circuit for each of said control relays, a lock relay governed by .traflic conditions in the vicinity of the switch and controlling the pick-up circuits for both control relays, the stick circuit for each control relay being independent of said lock relay and being controlled by contacts of both control relays, means for selectively establishing the pick-up circuits for said control relays, a normal and a reverse indication relay, means governed in accordance with the position occupied by the switch for energizing said indication relays, said means being operable to effectively energize the normal indication relay only in the normal position of the switch and being operable to effectively energize the reverse indication relay only in the reverse position of the switch, and means controlled by said control and indication relays for controlling said motor.

11. In combination, a railway track swich movable between a normal and a reverse position, a fluid pressure motor for moving said switch, a lock magnet valve device operable only when energized to supply fluid under pressure to said motor, a normal magnet valve device operable when energized to control the supply of fluid under pressure to the motor to cause it to move the switch to its normal position, a reverse magnet valve device operable when energized to control the supply of fluid under pressure to the motor to cause it to move the switch to its reverse position, a normal control relay operable when picked up to establish a circuit to energize the normal magnet valve device, a reverse control relay operable when picked up to establish a circuit to energize the reverse magnet valve device, a pick-up circuit for each of said control relays for supplying energy to the winding of such relay, means governed by trafiic conditions in the vicinity of the switch and controlling said pick-up circuits, means for selectively establishing each of said pick-up circuits, each of said control relays being operable when picked up to establish a stick circuit to maintain itself picked up, the stick circuit for each of the control relays being independent of the pick-up circuit for the relay and also of the means governed by traflic conditions in the vicinity of the switch and when established is interrupted when and only when the other control relay picks up, whereby on establishment of the pick-up circuit for either control relay and resultant picking up of such relay the relay is thereafter maintained picked up until the other control relay becomes picked up, and means governed by said control relays and by the position of the switch for energizing said lock magnet valve device.

12. In combination, a railway track switch tion, a fluid pressure motor for moving said switch; a lock magnet valve device operable only when energized to supply fluid under pressure to said motona normal magnet valve device operable when energized to control the, supply 'of fluid under pressure to the motor to cause it to move the switch to its normal position, a reverse magnet valve device operable when energized to control the supply of fluid under pressure to the movablebetween a normal and areverse posi-i which energy may be supplied to the reverse control relay irrespective of the condition of the normal control relay, means for selectively establishing said pick-up circuits, each of said control relays being operable when picked up provided the other control relay is released to establish a stick circuit to maintain itself picked up, the stick circuit for each of said control relays being independent of the pick-up circuit for the relay and when established is interrupted when and only when the other control relay picks up, whereby on establishment of the pickup circuit for either control relay and resultant picking up of such relay the relay is thereafter maintained picked up until the other control relay is picked up, and means governed by said.

control relays and by the position of the switch for energizing said lock magnet valve device.

HENRY S. YOUNG. 

